These are the Diff and Trans Drive Yokes for the Traxxas T-Maxx 3.3. TRAC78** 
                                                                               
FEATURES: Black plastic construction                                           
                                                                               
INCLUDES: Two drive yokes                                                      
          Two 4x15mm Yoke pins                                                 
                                                                               
REQUIRES: T-Maxx 3.3                                                           
                                                                               
SPECS:    Length: 15/16" (23mm)                                                
          Diameter: 3/4" (17mm)